Billboard Year-End charts are a cumulative measure of a single or album's performance in the United States, based upon the Billboard magazine charts during any given chart year. Billboard's "chart year" runs from the first Billboard "week" of December to the final week in November, but because the Billboard week is dated in advance of publication, the last calendar week for which sales are counted is usually the third week in November.[1] This altered calendar allows for Billboard to calculate year-end charts and release them in time for its final print issue in the last week of December. Prior to incorporating chart data from Nielsen SoundScan (from 1991), year-end charts were calculated by an inverse-point system based solely on a title's performance (for example a single appearing on the Billboard Hot 100 would be given one point for a week spent at position 100, two points for a week spent at position ninety-nine, and so forth, up to 100 points for each week spent at number one). Other factors including the total weeks a song spent on the chart and at its peak position were calculated into its year-end total, the same method was used for albums based on the Billboard 200, and songs appearing on the other charts (e.g. Hot Country Singles).[citation needed]

After Billboard began obtaining sales and airplay information from Nielsen SoundScan and Nielsen Broadcast Data Systems, the year-end charts are now calculated by a very straightforward cumulative total of yearlong sales (or sales and airplay) points.[citation needed] This gives a more accurate picture of any given year's most popular titles, as an entry that hypothetically spent nine weeks at number one in the spring could possibly have earned fewer cumulative points than one spending six weeks at number three in January. Due to this methodology, albums at the peak of their popularity at the time of the November/December chart-year cutoff many times end up ranked lower than one would expect on a year-end tally, yet are ranked on the following year's chart as well, as their cumulative points are split between the two chart years.

Between 1959 and 1963 the chart was divided in a stereo chart and a mono chart and were named Best-Selling Stereophonic LPs and Best-Selling Monophonic LPs (1959–1960), Stereo Action Charts and Mono Action Charts (1960–1961), Action Albums—Stereophonic and Action Albums—Monophonic (1961) and Top LPs—Stereo and Top LPs—Monaural (1961–1963).

1.
Single (music)
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In music, a single or record single is a type of release, typically a song recording of fewer tracks than an LP record, an album or an EP record. This can be released for sale to the public in a variety of different formats, in most cases, a single is a song that is released separately from an album, although it usually also appears on an album. Typically, these are the songs from albums that are released separately for promotional uses such as digital download or commercial radio airplay and are expected to be the most popular, in other cases a recording released as a single may not appear on an album. As digital downloading and audio streaming have become prevalent, it is often possible for every track on an album to also be available separately. Nevertheless, the concept of a single for an album has been retained as an identification of a heavily promoted or more popular song within an album collection. Despite being referred to as a single, singles can include up to as many as three tracks on them. The biggest digital music distributor, iTunes, accepts as many as three tracks less than ten minutes each as a single, as well as popular music player Spotify also following in this trend. Any more than three tracks on a release or longer than thirty minutes in total running time is either an Extended Play or if over six tracks long. The basic specifications of the single were made in the late 19th century. Gramophone discs were manufactured with a range of speeds and in several sizes. By about 1910, however, the 10-inch,78 rpm shellac disc had become the most commonly used format, the inherent technical limitations of the gramophone disc defined the standard format for commercial recordings in the early 20th century.26 rpm. With these factors applied to the 10-inch format, songwriters and performers increasingly tailored their output to fit the new medium, the breakthrough came with Bob Dylans Like a Rolling Stone. Singles have been issued in various formats, including 7-inch, 10-inch, other, less common, formats include singles on digital compact cassette, DVD, and LD, as well as many non-standard sizes of vinyl disc. Some artist release singles on records, a more common in musical subcultures. The most common form of the single is the 45 or 7-inch. The names are derived from its speed,45 rpm. The 7-inch 45 rpm record was released 31 March 1949 by RCA Victor as a smaller, more durable, the first 45 rpm records were monaural, with recordings on both sides of the disc. As stereo recordings became popular in the 1960s, almost all 45 rpm records were produced in stereo by the early 1970s

2.
Album
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Album, is a collection of audio recordings issued as a single item on CD, record, audio tape, or another medium. Albums of recorded music were developed in the early 20th century, first as books of individual 78rpm records, vinyl LPs are still issued, though in the 21st century album sales have mostly focused on compact disc and MP3 formats. The audio cassette was a format used from the late 1970s through to the 1990s alongside vinyl, an album may be recorded in a recording studio, in a concert venue, at home, in the field, or a mix of places. Recording may take a few hours to years to complete, usually in several takes with different parts recorded separately. Recordings that are done in one take without overdubbing are termed live, the majority of studio recordings contain an abundance of editing, sound effects, voice adjustments, etc. With modern recording technology, musicians can be recorded in separate rooms or at times while listening to the other parts using headphones. Album covers and liner notes are used, and sometimes additional information is provided, such as analysis of the recording, historically, the term album was applied to a collection of various items housed in a book format. In musical usage the word was used for collections of pieces of printed music from the early nineteenth century. Later, collections of related 78rpm records were bundled in book-like albums, the LP record, or 33 1⁄3 rpm microgroove vinyl record, is a gramophone record format introduced by Columbia Records in 1948. It was adopted by the industry as a standard format for the album. Apart from relatively minor refinements and the important later addition of stereophonic sound capability, the term album had been carried forward from the early nineteenth century when it had been used for collections of short pieces of music. Later, collections of related 78rpm records were bundled in book-like albums, as part of a trend of shifting sales in the music industry, some commenters have declared that the early 21st century experienced the death of the album. Sometimes shorter albums are referred to as mini-albums or EPs, Albums such as Tubular Bells, Amarok, Hergest Ridge by Mike Oldfield, and Yess Close to the Edge, include fewer than four tracks. There are no rules against artists such as Pinhead Gunpowder referring to their own releases under thirty minutes as albums. These are known as box sets, material is stored on an album in sections termed tracks, normally 11 or 12 tracks. A music track is a song or instrumental recording. The term is associated with popular music where separate tracks are known as album tracks. When vinyl records were the medium for audio recordings a track could be identified visually from the grooves

3.
Billboard (magazine)
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Billboard is an American entertainment media brand owned by the Hollywood Reporter-Billboard Media Group, a division of Eldridge Industries. It publishes pieces involving news, video, opinion, reviews, events and it is also known for its music charts, including the Billboard Hot 100 and Billboard 200, tracking the most popular singles and albums in different genres. It also hosts events, owns a publishing firm, and operates several TV shows, Billboard was founded in 1894 by William Donaldson and James Hennegan as a trade publication for bill posters. Donaldson later acquired Hennegens interest in 1900 for $500, in the 1900s, it covered the entertainment industry, such as circuses, fairs and burlesque shows. It also created a service for travelling entertainers. Billboard began focusing more on the industry as the jukebox, phonograph. Many topics it covered were spun-off into different magazines, including Amusement Business in 1961 to cover outdoor entertainment so that it could focus on music. After Donaldson died in 1925, Billboard was passed down to his children and Hennegans children, until it was sold to investors in 1985. The first issue of Billboard was published in Cincinnati, Ohio, on November 1,1894 by William Donaldson, initially, it covered the advertising and bill posting industry and was called Billboard Advertising. At the time, billboards, posters and paper advertisements placed in public spaces were the means of advertising. Donaldson handled editorial and advertising, while Hennegan, who owned Hennegan Printing Co. managed magazine production, the first issues were just eight pages long. The paper had columns like The Bill Room Gossip and The Indefatigable, a department for agricultural fairs was established in 1896. The title was changed to The Billboard in 1897, after a brief departure over editorial differences, Donaldson purchased Hennegans interest in the business in 1900 for $500, to save it from bankruptcy. That May, Donaldson changed it from a monthly to a paper with a greater emphasis on breaking news. He improved editorial quality and opened new offices in New York, Chicago, San Francisco, London and he also re-focused the magazine on outdoor entertainment like fairs, carnivals, circuses, vaudeville and burlesque shows. A section devoted to circuses was introduced in 1900, followed by more prominent coverage of events in 1901. Billboard also covered topics including regulation, a lack of professionalism, economics and it had a stage gossip column covering the private lives of entertainers, a tent show section covering traveling shows and a sub-section called Freaks to order. According to The Seattle Times, Donaldson also published articles attacking censorship, praising productions exhibiting good taste

4.
Billboard Hot 100
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The Billboard Hot 100 is the music industry standard record chart in the United States for singles, published weekly by Billboard magazine. Chart rankings are based on sales, radio play and online streaming, the weekly sales period was originally Monday to Sunday, when Nielsen started tracking sales in 1991, but was changed to Friday to Thursday in July 2015. Radio airplay, which, unlike sales figures and streaming data, is available on a real-time basis. A new chart is compiled and officially released to the public by Billboard on Tuesdays, as of the issue for the week ending on April 15,2017, the Hot 100 has had 1,061 different number one hits. The current number one song is Shape of You by Ed Sheeran, prior to 1955, Billboard did not have a unified, all-encompassing popularity chart, instead measuring songs by individual metrics. At the start of the era in 1955, three such charts existed, Best Sellers in Stores was the first Billboard chart, established in 1936. This chart ranked the biggest selling singles in retail stores, as reported by merchants surveyed throughout the country, Most Played by Jockeys was Billboards original airplay chart. It ranked the most played songs on United States radio stations, as reported by radio disc jockeys, Most Played in Jukeboxes ranked the most played songs in jukeboxes across the United States. On the week ending November 12,1955, Billboard published The Top 100 for the first time, the Top 100 combined all aspects of a singles performance, based on a point system that typically gave sales more weight than radio airplay. The Best Sellers In Stores, Most Played by Jockeys and Most Played in Jukeboxes charts continued to be published concurrently with the new Top 100 chart. The week ending July 28,1958 was the publication of the Most Played By Jockeys and Top 100 charts. On August 4,1958, Billboard premiered one main all-genre singles chart, the Hot 100 quickly became the industry standard and Billboard discontinued the Best Sellers In Stores chart on October 13,1958. The Billboard Hot 100 is still the standard by which a songs popularity is measured in the United States, the Hot 100 is ranked by radio airplay audience impressions as measured by Nielsen BDS, sales data compiled by Nielsen Soundscan and streaming activity provided by online music sources. There are several component charts that contribute to the calculation of the Hot 100. Charts are ranked by number of gross audience impressions, computed by cross-referencing exact times of radio airplay with Arbitron listener data. Hot Singles Sales, the top selling singles compiled from a sample of retail store, mass merchant and internet sales reports collected, compiled. The chart is released weekly and measures sales of commercial singles. With the decline in sales of singles in the US

5.
Billboard 200
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The Billboard 200 is a record chart ranking the 200 most popular music albums and EPs in the United States, published weekly by Billboard magazine. It is frequently used to convey the popularity of an artist or groups of artists, often, a recording act will be remembered by its number ones, those of their albums that outperformed all others during at least one week. The chart is based mostly on sales of albums in the United States, the weekly sales period was originally Monday to Sunday when Nielsen started tracking sales in 1991, but since July 2015, tracking week begins on Friday and ends on Thursday. A new chart is published the following Tuesday with an issue post-dated to the Saturday of the following week, the charts streaming schedule is also tracked from Friday to Thursday. Example, Friday January 1 – sales tracking week begins Thursday January 7 – sales tracking week ends Tuesday January 12 – new chart published, New product is released to the American market on Fridays. Digital downloads of albums are included in Billboard 200 tabulation. Albums that are not licensed for sale in the United States are not eligible to chart. As of the issue dated April 15,2017, the album on the Billboard 200 is More Life by Drake. Billboard began an album chart in 1945, initially only five positions long, the album chart was not published on a weekly basis, sometimes three to seven weeks passing before it was updated. A biweekly, 15-position Best-Selling Popular Albums chart appeared in 1955, the position count varied anywhere from 10 to 30 albums. The first number-one album on the new weekly list was Belafonte by Harry Belafonte, the chart was renamed to Best-Selling Pop Albums later in 1956, and then to Best-Selling Pop LPs in 1957. Beginning on May 25,1959, Billboard split the ranking into two charts Best-Selling Stereophonic LPs for stereo albums and Best-Selling Monophonic LPs for mono albums and these were renamed to Stereo Action Charts and Mono Action Charts in 1960. In January 1961, they became Action Albums—Stereophonic and Action Albums—Monophonic, three months later, they became Top LPs—Stereo and Top LPs—Monaural. On August 17,1963 the stereo and mono charts were combined into a 150-position chart called Top LPs, on April 1,1967, the chart was expanded to 175 positions, then finally to 200 positions on May 13,1967. In 1960, Billboard began concurrently publishing album charts which ranked sales of older or mid-priced titles and these Essential Inventory charts were divided by stereo and mono albums, and featured titles that had already appeared on the main stereo and mono album charts. In January 1961, the Action Charts became Action Albums—Monophonic, Albums appeared on either chart for up to nine weeks, then were moved to an Essential Inventory list of approximately 200 titles, with no numerical ranking. This list continued to be published until the consolidated Top LPs chart debuted in 1963, in 1982, Billboard began publishing a Midline Albums chart which ranked older or mid-priced titles. The chart held 50 positions and was published on a bi-weekly basis, on May 25,1991, Billboard premiered the Top Pop Catalog Albums chart

6.
International Standard Book Number
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The International Standard Book Number is a unique numeric commercial book identifier. An ISBN is assigned to each edition and variation of a book, for example, an e-book, a paperback and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January 2007, the method of assigning an ISBN is nation-based and varies from country to country, often depending on how large the publishing industry is within a country. The initial ISBN configuration of recognition was generated in 1967 based upon the 9-digit Standard Book Numbering created in 1966, the 10-digit ISBN format was developed by the International Organization for Standardization and was published in 1970 as international standard ISO2108. Occasionally, a book may appear without a printed ISBN if it is printed privately or the author does not follow the usual ISBN procedure, however, this can be rectified later. Another identifier, the International Standard Serial Number, identifies periodical publications such as magazines, the ISBN configuration of recognition was generated in 1967 in the United Kingdom by David Whitaker and in 1968 in the US by Emery Koltay. The 10-digit ISBN format was developed by the International Organization for Standardization and was published in 1970 as international standard ISO2108, the United Kingdom continued to use the 9-digit SBN code until 1974. The ISO on-line facility only refers back to 1978, an SBN may be converted to an ISBN by prefixing the digit 0. For example, the edition of Mr. J. G. Reeder Returns, published by Hodder in 1965, has SBN340013818 -340 indicating the publisher,01381 their serial number. This can be converted to ISBN 0-340-01381-8, the check digit does not need to be re-calculated, since 1 January 2007, ISBNs have contained 13 digits, a format that is compatible with Bookland European Article Number EAN-13s. An ISBN is assigned to each edition and variation of a book, for example, an ebook, a paperback, and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January 2007, a 13-digit ISBN can be separated into its parts, and when this is done it is customary to separate the parts with hyphens or spaces. Separating the parts of a 10-digit ISBN is also done with either hyphens or spaces, figuring out how to correctly separate a given ISBN number is complicated, because most of the parts do not use a fixed number of digits. ISBN issuance is country-specific, in that ISBNs are issued by the ISBN registration agency that is responsible for country or territory regardless of the publication language. Some ISBN registration agencies are based in national libraries or within ministries of culture, in other cases, the ISBN registration service is provided by organisations such as bibliographic data providers that are not government funded. In Canada, ISBNs are issued at no cost with the purpose of encouraging Canadian culture. In the United Kingdom, United States, and some countries, where the service is provided by non-government-funded organisations. Australia, ISBNs are issued by the library services agency Thorpe-Bowker

Barbadian singer Rihanna's "We Found Love" came in at number 69 in 2011 and rose to position 8 this year. She had a total of six songs included on the list, with her as a lead artist on 5 songs. Four of which were from her sixth album Talk That Talk, and one was from her seventh album Unapologetic.